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Double Bass 5 string vs C extension.

1. You need a longer string. Many many different strings available, although not all manufacturers supply them, and even those that do, not always for all their lines of strings.

2. I have seen B extensions, even a mechanical one, but they do look particularly hard work! I guess, as most extensions are pretty much custom made, you can have whatever you want!
 
2. I have seen B extensions, even a mechanical one, but they do look particularly hard work! I guess, as most extensions are pretty much custom made, you can have whatever you want!

Why do you think it is hard work? are those few extra inches length going to make that much difference? Will C extension strings also fit the B extension?

And two more questions
1. can adding a C extension to a bass make it top/neck heavy? or is the added weight not so much?
2. where do you leave the thumb when playing the low notes on the extension?
 
I've never played a B extension, it just LOOKS hard work!

The C extension has made my bass neck heavy, but only just. I have to leave my duster over the end pin! In fairness, I have a keyed Fawcett type, and a gated one is probably a lot lighter.

Again, keyed extension means no problems with where your thumb goes, so someone else will have to tell you that!
 
Thinking about getting a C extension. I have two questions though:

1. Can any normal E string be used for it or do you need a special longer string?

2. Is there also such a thing as a B extension? Or would that fingerboard be too long to reach for the left hand? Or too long for the string to fit?
Yes, you do need a longer string, but the luthier will provide that. You can get low B extensions
 
Agreed. The idea was good though :)

Instead of going lower you can also tune the other strings a fourth higher and still get the low E or F with the extension. I have one bass tuned in ADGC.
Now my 'only' problem is finding the right string.
You could try an F# extension string, tuned to G. GDGC, which would be Edgar Meyer's tuning, a minor 3rd up.
 
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For solo work, Edgar's tuning makes perfect sense, for two reasons. First, not much solo rep makes much use of the bottom string. Second, saves you the coin for a solo F# string. Why do we not all just leave our basses in 4ths? Lots of people manage to play lots of music like that
 
You could try an F# extension string, tuned to G. GDGC, which would be Edgar Meyer's tuning, a minor 3rd up.

Yes I sometimes do that already by detuning the A string. Don't need an extension for that. The reason for an extension would be that I could still have the low E in case if a B extension or the low F in case of a C extension.

You can say why not using a 5 string? But I just prefer 4 string basses for the reasons already mentioned by others in this topic.
 
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An F# extension string, tuned up to G, would let you get down to a low Eb. Certainly an unusual tuning! With a gated extension you could leave the first gate closed, giving you back the "open" E string.

I used to play a 4 string bass with an extension. It drove me nuts. When I found a 5 string, I made the leap. I will post about my bass later.
 
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An F# extension string, tuned up to G, would let you get down to a low Eb. Certainly an unusual tuning! With a gated extension you could leave the first gate closed, giving you back the "open" E string.
.

You might be on to something! I will consider this tuning. It’s less ideal for me than the ADGC tuning with extension to E. But that’s seems impossible for now since there are no extended A strings. So I have to drop that idea I guess.